Guru Meditation Error: Core 1 panic'ed (IntegerDivideByZero). Exception was unhandled

Using the Material Test from Lightburn on my xTool D1 gives this about 70% of the way through the burn.


M8 N4
M8 N4
M8 N4
M8 N4
M8 N4
M8 N4
M8 N4
Guru Meditation Error: Core 1 panic’ed (IntegerDivideByZero). Exception was unhandled.
Core 1 register dump:
PC : 0x40085038 PS : 0x00060d31 A0 : 0x80085e66 A1 : 0x3ffc0090
A2 : 0x00002710 A3 : 0x00000000 A4 : 0x9999999a A5 : 0x40999999
A6 : 0x3ffbac14 A7 : 0x3ffb844c A8 : 0x8008502f A9 : 0x3ffc0070
A10 : 0x3ffbac14 A11 : 0x00000666 A12 : 0x0000000b A13 : 0x00000666
A14 : 0x7ff00000 A15 : 0x7ff99999 SAR : 0x00000015 EXCCAUSE: 0x00000006
EXCVADDR: 0x00000000 LBEG : 0x400029ac LEND : 0x400029cb LCOUNT : 0x00000000
Core 1 was running in ISR context:
EPC1 : 0x40085038 EPC2 : 0x00000000 EPC3 : 0x00000000 EPC4 : 0x4008d7a4
ELF file SHA256: 0000000000000000
Backtrace: 0x40085038:0x3ffc0090 0x40085e63:0x3ffc00c0 0x40085efd:0x3ffc00e0 0x400866b9:0x3ffc0100 0x4008d019:0x3ffc0120 0x40089998:0x3ffb1ef0 0x4008a613:0x3ffb1f10 0x4008653f:0x3ffb1f30 0x400d4152:0x3ffb1f50 0x40081b02:0x3ffb1f70 0x400d2c32:0x3ffb1f90 0x400e48e5:0x3ffb1fb0 0x400909e6:0x3ffb1fd0
Rebooting…
f~f~
M2001 192.168.86.185

I’m new to LightBurn and I’m in my 30 day trial. Definitely think this is the way I’d like to go but I have the same error the OP has.
Layer C00
M8 N1
Guru Meditation Error: Core 1 panic’ed (IntegerDivideByZero). Exception was unhandled.
Core 1 register dump:
PC : 0x40085038 PS : 0x00060331 A0 : 0x80085ee4 A1 : 0x3ffc0090
A2 : 0x00002710 A3 : 0x00000000 A4 : 0x3ffb854c A5 : 0x3ffb1f50
A6 : 0x3ffbac04 A7 : 0x3ffb844c A8 : 0x8008502f A9 : 0x3ffc0070
A10 : 0x3ffbac04 A11 : 0x00000000 A12 : 0x00000000 A13 : 0x00008000
A14 : 0x7ff00000 A15 : 0x00000c04 SAR : 0x00000005 EXCCAUSE: 0x00000006
EXCVADDR: 0x00000000 LBEG : 0x400029ac LEND : 0x400029cb LCOUNT : 0x00000000
Core 1 was running in ISR context:
EPC1 : 0x40085038 EPC2 : 0x00000000 EPC3 : 0x00000000 EPC4 : 0x4008d7a4
ELF file SHA256: 0000000000000000
Backtrace: 0x40085038:0x3ffc0090 0x40085ee1:0x3ffc00c0 0x40085efd:0x3ffc00e0 0x400866b9:0x3ffc0100 0x4008d019:0x3ffc0120 0x400899da:0x3ffb1ed0 0x4008a613:0x3ffb1ef0 0x4008654b:0x3ffb1f10 0x400d305f:0x3ffb1f30 0x400d3179:0x3ffb1f50 0x40081c3f:0x3ffb1f70 0x400d2c32:0x3ffb1f90 0x400e48e5:0x3ffb1fb0 0x400909e6:0x3ffb1fd0
Rebooting…

I should point out that I am up to date with all firmware and versions on my windows 10 machine. To reproduce, simply use the materials test in lightburn with speed going from 1 to 10 mm/s on a 10w xtool D1. I just purchased lightburn as it seemed like it would work great, but I keep hitting this wall and wasting material. Please help.

I just emailed LightBurn support but being a Sunday night, and a 3 day weekend, I’m sure any response will be delayed. I’ll post back if I get any help.

Lightburn support wrote back. Here’s what they said

We have seen this issue one time before, and the user solved the issue by using a different laptop. We never got to the bottom of the issue, but believed it to be a problem with the controller.

One thing you might try is changing your ‘Transfer mode’ from ‘Buffered’ to ‘Synchronous’ in your ‘Device Settings’.

The last ditch effort would be to re-flash the firmware on the board.

Let us know how that goes.

Cheers,
LightBurn Software Support

For me my laptop is very new running Windows 11 and my only other computer is a work computer, so trying a different computer is not going to work for me. I will try changing the transfer mode and see what that does. I’m sure it won’t be that simple…

Can you confirm what specific version of the firmware you are currently running?

Consider also applying the V005 beta firmware. Not certain if this will resolve the issue but seems it addresses other known issues with their GRBL implementation so may be worth a shot.

Notification of the Update of Beta Versions xTool D1 Firmware V005 – xTool

Thanks berainlb, I am running the latest firmware. I may have to give the V005 beta a try.

Scott, I tried changing the transfer mode from buffered to synchronous last night and it did not help. However, it has been working today. The only difference is I restarted my laptop this morning.

Hope this helps!

buffered to synchronous change seemed to work, at least for the material test which had failed before. No other changes were made and this worked. I am running the latest on all firmware and lightburn versions.

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